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In Frog Finder you have generally two options: shoot or guess. I know that it is caused by my own stupidity, but today I guessed two times when I wanted to shoot and I shot one time when I wanted to guess. Very annoying ;)
So what I am suggesting is to have a different marker for the field when guessing. Maybe a flag, similar to the well known Minesweeper. So I would notice that I did click the wrong link before hitting the submit button.
MadMonkey: It would even help if there was something on the last page before submitting that would indicate that you're guessing. Now I started to hit the back button and look at the little red sentence over the board, which tells me wether to shoot or guess. But a graphical indicator is always preferred ;)